Decarbonization and total nitrogen removal treating process for semi-coking wastewater

Abstract

The invention discloses a decarbonization and total nitrogen removal treating process for semi-coking wastewater. The process comprises a pretreatment system, a biochemical treatment system and a deep treatment system, wherein the pretreatment system comprises an oil separation tank and second-stage air flotation treatment, the biochemical treatment system comprises a multifunctional denitrification tank, a first aerobic pool, a second precipitation tank, an anoxic tank, a second aerobic pool and a third precipitation tank, an HSBEMBM environmental management microbial preparation is added to the multifunctional denitrification tank, the first aerobic pool, the anoxic tank and the second aerobic pool respectively, a mixed solution of the first aerobic pool partially flows back to the multifunctional denitrification tank, the deep treatment system comprises a photocatalytic ozone oxidation reaction tower, the biochemical treatment system further comprises a sludge adsorption bed reaction tank, the first aerobic pool is provided with a plurality of reflux inlets in the flow direction, and a gas collecting pipe is arranged at the top of the photocatalytic ozone oxidation reaction tower and is used for collecting residual ozone overflowing from a water surface and then leading the collected residual ozone into a first-stage cavitation air flotation tank. Through treating with the systems of the process disclosed by the invention, a very good treatment effect for the semi-coking wastewater can be achieved, meanwhile, the adaptability is strong, and the operation is convenient.

Description

Technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a blue charcoal wastewater decarbonization and total nitrogen removal treatment process. Background technique [0002] Blue charcoal is also called semi-coke. It is a low volatile solid carbon product obtained by pyrolysis of long flame coal, non-stick coal and weakly cohesive coal, etc. through medium and low temperature dry distillation (600~800℃). Coking wastewater is similar. The dry distillation temperature in coke production is about 1000 ℃, while the dry distillation temperature in blue coal production is low. Therefore, the blue charcoal wastewater contains a large number of low- and medium-molecular-weight pollutants that have not been oxidized at high temperature, and its concentration is about 10 times higher than that of coking wastewater. The blue charcoal wastewater mainly contains high concentrations of organic and inorganic substances. The org...

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Problems solved by technology

[0003] Existing semi-coke enterprises mostly use physical, chemical and biological methods for wastewater treatment systems: the main treatment methods include adsorption method, flue gas treatment method, activated sludge method, incineration method, catalytic oxidation-biochemical method, ammonia distillation Dephenol-SBR method and emulsion liquid membrane method, etc., they have problems: high investment cost, high treatment cost, poor applicability, difficult treatment or secondary pollution, such as high treatment cost of adsorption method, difficult adsorption regeneration , is not suitable for high-concentration wastewater treatment. The flue gas method requires that the ammonia content in the wastewater must be balanced with the amount of ammonia required by the flue gas, and its use is limited; the incineration method has a large investment, high requirements for water quality, and poor applicability; catalytic The oxidation method needs to be carried out under high temperature and high pressure conditions, and the treatment cost is high, and the investment scale and operation cost are large; the ammonia distillation and dephenolization-SBR method needs to use an organic solvent for dephenolization, which will cause secondary pollution, and the ammonia nitrogen will be affected after the dephenolization treatment. The treatment efficiency increases the difficulty of subsequent treatment, which may make the effluent unable to meet the direct discharge standard in Table 2 of the "Coking Chemical Industry Pollutant Discharge Standard" GB16171-2012

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